When installing new axles in rearends with posi traction differentials, be sure to install the driver's side axle first to keep the splines properly aligned. Failure to do so may move the two splined gears out of alignment, and it may be difficult to install the driver's side axle properly if the passenger side axle is already installed.

Ifinstallation of passenger side axle is done first it may require two people when installing the driver's side axle, with both parties rotating reach axle until splines are in line and the driver's side axle fully sides into the housing.

To ensure you get the most out of your new 9 Inch components, Currie recommends that you perform a proper break-in process:

Use a name brand mineral-based gear oil, preferably 85w140 (Extremely high quality synthetic oils may be used once break-in process has been successfully performed)

Place vehicle on jack stands and let the rearend spin while the vehicle idles - run transmission in both forward and reverse periodically throughout the process

Continue to run the rearend until the pinion gets hot (place hand on bottom of the differential housing to verify this)

Proper break-in allows:

The ability to install new axles and hit the track the same day without worry

Extended life for rearend components

Keeps the quality and life of your gear oil

Note: If you find that your rearend is running somewhat "tight" be sure to add Currie's 9+ Friction Modifier to "loosen up". If a more aggressive performance is desired, Friction Modifier is not needed.

Application

2.500" brake spacing offset

2.800" axle register diameter

Specs

2.500" brake spacing offset

2.800" axle register diameter

Customer Reviews

Perfect fit

February 25, 2013

I converted a 1966 MUSTANG from a 8" rear to this 9" rear. The fit was a perfect match. I also purchased the third member from Speedway making he package complete making this bullet proof for a 289 with 5 speed manual trans and weian blower.!

how much hp will this axle safely support
Putting in a 23 t with 936 hp

how much hp will this axle safely support
Putting in a 23 t with 936 hp

Answers

August 15, 2014

EricM

This is a standard run of the mill 31 spline 9" Ford rear end.
You should look into some drag racing rear ends which are designed to handle that sort of power. Sorry we do not offer anything that will be up to the task.

1 answers

67 mustang coupe
I don't know much about cars but I'm trying to learn as best I can. I have a 67 mustang coupe I'm working on and I know I need a 9" with posi traction and 3:50. Will this do the job?

Jumpkin

South Carolina, USA

January 11, 2014

67 mustang coupe
I don't know much about cars but I'm trying to learn as best I can. I have a 67 mustang coupe I'm working on and I know I need a 9" with posi traction and 3:50. Will this do the job?

Answers

January 14, 2014

EricM

Theis bare axle housing kit could be used but will require welding on the spring pads and other parts.
We do offer a complete 9” housing with brackets and axles installed for the 67-70 Mustang in the correct width under number 91046770. To complete the installation with the third member number 91048345 with a 350 ratio and comes with the Currie posi unit ready for installation. Add a gasket number 9192300 and a gallon of lube of choice and you are ready to install. We also offer complete drum brake kits or bolt on disc brakes if so inclined.

1 answers

Can this be used in a 71 camaro?

Rmckeever

Atlanta, GA, USA

March 24, 2013

Can this be used in a 71 camaro?

Answers

March 25, 2013

Jason

Part number 91045100 is a 9” rear axle option for our earlier hot rod chassis and offers a 56” hub face to hub face dimension and the installer would need to add the necessary mounts for the leaf springs, etc. Speedway offers a direct bolt in for the 70-81 Camaro under part number 91007081. It includes the Currie axles and if you add the third member under number 91048345 in the desired ratio and the brake package you prefer whether disc or drum you would have a bolt in rear end the correct width with the strength of a 9” Ford. Add the gear lube and gasket and you would be set.

2 answers

Hey is the pinion centered or is the housing centered putting the pinion off center and if so how much off?

August 10, 2011

Hey is the pinion centered or is the housing centered putting the pinion off center and if so how much off?

Answers

August 12, 2011

John

This is a centered housing rear end with a pinion offset of approximately 2 3/8”. It uses a short and long axle to compensate for the offset.

September 19, 2012

KENT

This particular kit is housing centered. Housing centered on the 9" means that the pinion is offset to the passenger side .94 inches from center. When housing centered, if you measure from the pinion to each housing end, there will be a 2 x .94" = 1.88" difference in measured lengths. (1 side was shortened .94" and the other side was lengthened .94")

This will be going into my 72 Nova. I will be going with ridler 695 wheels, 18x9.5, +6mm offset and 5.49" backspace. I will be going with wilwood disc brakes. What length housing will I need?

Answers

June 23, 2015

Eric

Expert

If you have a particular wheel and tire combination that you want to use then the best bet to get them to fit correctly into the tight wheel well of your Nova will be to remove the stock rear end then mock up the tires and wheels that you will use and measure from wheel to wheel to get the perfect width of rear end.

Can you recommend everything I need to complete this rear end with the part numbers?

Can you recommend everything I need to complete this rear end with the part numbers?

Answers

October 14, 2015

John

Expert

To complete the 9" rear end you will need a third member such as number 91048345 in choice of ratio, gasket such as number 9192300, rear end lube of choice, Brake kit number 91031921 with emergency brakes, two axle pads if using leaf springs under number 54585090 along with leaf spring plates and U-bolts, or coil spring brackets and triangulated hardware as needed if application is for coil suspension. Other options would include 4 bar and coil overs with panhard bar or air ride.

NOTE: All Ford 9" full spools use overhaul kit 9190950-31, even if they are a 28-spline spool. The 9190950-31 contains the large I.D. standard O.D. carrier bearings and pinion bearings needed for use with our full spools.

If you are using the H.D. nodular iron center section which uses the large diameter carrier bearings, order kit 9190950-31s, which also includes the large pinion bearings for use with the Daytona pinion support.

If you’re looking for a complete third member for your Ford 9-inch rear end housing, but want the added performance of a limited slip differential, Speedway Motors now offers you a 9" Ford street 3rd member for your street rod, muscle car or truck. We start with a new carrier housing and then install bearings, seals, a heavy duty "Daytona" pinion support, a 1310-series yoke, and your choice of ring-and-pinion ratios. The 1310-series yoke is the correct size for many Ford applications with cups 1-1/16 inch in outside diameter and a span of 3-7/32 inch across.

These Ford 9 inch third member assemblies feature a Richmond Powertrax Grip Pro limited slip differential available in 28 or 31 spline axle shaft configurations. This helical gear differential is perfect for light-to-medium weight street vehicles where one wants posi-action without the adverse handling effects or noise of a full locker. Because there are no friction plates, there is no friction modifier additive necessary.

All third members are assembled by our team of professionals and are delivered to you in a handy plastic carrying case, for an overall value that can’t be beat

Available in your choice of 3.50, 3.70, 3.89, 4.11 or 4.56 gear ratio.

If you have built anything that has serious horsepower you know the weak link can be the stock Ford 9" carrier. The pinion area tends to be weak and if you throw enough power at it, it will break. That won't happen with this brand new housing.

This new cast iron housing is built to take street/strip abuse without the fear of breaking. Case has forged caps and extra beef where it's needed. Most stock differentials use the 3.062" o.d. bearings # TLM603049 w/ 1.781" i/d. You should also add a new heavy duty cast iron pinion support while you're at it.

This brand new carrier housing is built to take street/strip abuse without the fear of breaking. Our aluminum housing has forged caps and extra beef where it's needed. Most stock differentials use the 3.062" o.d. bearings # TLM603049 w/ 1.781" i/d.

The aluminum case will save you 20 lbs. over the cast iron version. You should also add a new heavy duty aluminum pinion support while you're at it.

These wheel studs manufactured from Currie Enterprises are designed for use in disc or drum brake applications. The press-in style wheel studs are made of a high strength steel and are sold individually.

This "large bearing" tapered roller axle bearing and seal kit is a replacement for Currie 9 Inch housing, all 9" Ford tapered bearing rearend applications, or any rearend that has had a 9" Ford style housing end and axle conversion performed.

If you’re looking for a complete third member for your Ford 9-inch rear end housing, but want the added performance of a limited slip differential, Speedway Motors now offers you a 9" Ford street 3rd member for your street rod, muscle car or truck. We start with a Currie CE-94027F Ford "N" nodular iron carrier housing and then install bearings, seals, a heavy duty "Daytona" pinion support, a 1310-series yoke, and your choice of ring-and-pinion ratios. The 1310-series yoke is the correct size for many Ford applications with cups 1-1/16 inch in outside diameter and a span of 3-7/32 inch across.

These Ford 9 inch third member assemblies feature a Richmond Powertrax Grip Pro limited slip differential available in 28 or 31 spline axle shaft configurations. This helical gear differential is perfect for light-to-medium weight street vehicles where one wants posi-action without the adverse handling effects or noise of a full locker. Because there are no friction plates, there is no friction modifier additive necessary.

All third members are assembled by our team of professionals and are delivered to you in a handy plastic carrying case, for an overall value that can’t be beat.

Available in your choice of 3.50, 3.70, 3.89, 4.11 or 4.56 gear ratio.

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